SU1295020A1 - Piston for internal combustion engine - Google Patents

Abstract

The invention relates to the field of engine building, can be used in the manufacture and repair of pistons of internal combustion engines and allows to increase the reliability of the piston. The engine piston contains a head 1 with a groove 2 for a piston ring 3. On the lower end surface 4 of the groove 2 there is a removable anti-wear insert 5 with a protrusion 6 inserted into the annular groove 7. The gaps between the insert and the lower end surface of the caucus, and also between the groove 7 and the protrusion 6 is filled with self-hardening polymeric material II. In the insert 5, uniformly around the circumference are made through radial holes 12, in which the pins are arranged with a gap along the diameter. The axis of one of the holes passes through the lock insert. The latter is made of a composite of two half-rings. Due to the difference in the tp of the upper and lower portions of the piston head, the lower end surfaces of the grooves become conical and tend to detach from anti-wear inserts. By filling all the irregularities with a polymeric material, full contact is created in the connection between the head and the insert 5. Due to the presence of the pins, the insert tends to increase in diameter, thereby increasing its pressure against the groove in the groove. 2 h. the item of f-ly, 4 ill. a & (L N5; о С71 О ю 19

Description

The invention relates to the field of engine building and can be used in the manufacture and repair of pistons-engines of internal combustion.

The aim of the invention is to improve the reliability of the piston.

FIG. 1 shows the piston assembly; in fig. 2 is a view A of FIG. one; in fig. 3 is a section BB in FIG. 1 (a piston version with a single cut anti-wear insert); in FIG. 4 is a section BB in FIG. 1 (piston version with two-part anti-wear insert).

The engine piston contains a BOLT 1 with a groove 2 for the piston ring 3. On the lower end surface 4 of the groove 2 there is a removable anti-wear insert 5 with a protrusion 6 inserted into the ring groove 7 located in the groove 2. The insert 5 can have one lock 8 (fig. -3) or at least two locks 9 and 10 (fig. 4). The gaps between the insert 5 and the bottom end surface 4 of the grooves, as well as between the groove 7 and the protrusion 6 of the insert 5, are filled with self-hardening polymeric material 11, which is introduced in a liquid form when the insert is inserted into the canadian core and hardens in the gaps. Through the radial holes 12 are made uniformly around the circumference in which the pins 13 are spaced with a gap. The gaps between the holes 12 and the pins 13 are filled with self-hardening polymer material 11, which is introduced into the gaps in a liquid form when the rods are installed and cures gaps. The pins 13 are fixed in the head 1 on the thread 14.

Through the gap 15 of each of the locks 8-10 of the ring 5 passes the axis 16 of the radial hole 12, during processing each channels 17 are formed at the ends 17 of the insert. Installing the last pins 13 with polymer material 11 ensures that the ends 17 of the insert are fixed from bulging (tearing them off the end face). surface grooves 4) in operation.

The number of circumferentially inserted inserts 5 holes 12 with pins 13 installed in them for insertion with one lock 8 is at least four. In an insert consisting of several parts, i.e. having several (at least 2) locks 9 and 10, the axes of the holes 12 pass through at least the middle of the arc length of each part of the insert and through the lock 15 in each section of the ring.

The anti-wear insert 5 has an outer surface 19, and the piston 1 is shown in a position where the combustion chamber 20 is at the top.

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0 5 0

When the internal combustion engine is operating, the pulsating pressure of gases in the cylinder presses the piston ring 3 against the anti-wear insert 5 and, acting on the outer surface 19 of the anti-wear insert, tends to shift it in the radial direction. Since the upper part of the piston head is heated more than the lower one, the lower end surfaces of the grooves become tapered (shown by a dotted line) and tend to detach from the wear inserts with their outer edges. However, due to the elasticity of the polymer material and filling in the liquid form of all irregularities of the mating surfaces, complete contact (no gaps) in the head connection with the antiwear insert is created, which prevents movement of the antiwear insert and fretting wear, as well as the formation of coke deposits connection.

In operation, the temperature of the antiwear insert is greater than the temperature of the groove. Since the elongation of the insert around the circumference is prevented by the pins, it tends to increase in diameter, thereby increasing the pressure of its protrusion into the groove in the groove, which creates an additional fastening of the insert to the groove.

Claims (3)

Invention Formula . A piston for an internal combustion engine, comprising a head with a groove under the piston ring, at the lower end of which an annular groove is made, and a split annular insert with a lock and lower annular collar are placed in the groove of the lower end of the groove, characterized in that reliability, the insert is made with radial through holes evenly spaced around its perimeter, and the head is provided with radial pins placed with a gap in the insert, with the gaps between the insert and the bottom surface of the groove and The holes in the inserts are filled with polymeric material. 2. Piston for and. 1, characterized in that at least four radial through-holes are made in the insert, and the axis of one of them passes through the insert lock. 3. Piston on PP. 1 and 2, characterized in that the insert is made of a composite of two half-rings, with the axes of two radial through-holes passing through both locks. WadA five - nineteen lPLi2J nineteen 2.4